how to calcute antenna dimensions for cpw fed microstrip patch antenna for UWB antenn

Hi all
can any one tell me which formulas will be applicable for this kind of design
any paper for such type of design
waiting in anticipation
kartik

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a circular cpw antenna
i need how to calculate cpw dimensions
central cpw feed length
radius of the patch
what is the maximum gain which this antenna can have
with dimensions less than 20X20mm2
I want calculation swith FR4 dielectric with Er=4.4 and loss tangent 0.002

hi
u can find the dimension formula in this paper by K. P. Ray
Research Article
Design Aspects of Printed Monopole Antennas for
Ultra-Wide Band Applications
Hindawi Publishing Corporation
International Journal of Antennas and Propagation
Volume 2008, Article ID 713858, 8 pages
doi:10.1155/2008/713858

hi
maybe this software from Q-PAR company can help you